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Geographic Regions (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenue |  |  |  |  |  |  |  |  | $ 85,035 | $ 100,053 | $ 83,073
Operating income (loss) | $ 1,653 | $ 1,351 | $ 1,248 | $ 664 | $ (1,100) | $ 2,826 | $ 1,485 | $ 2,861 | 4,916 | 6,072 | 3,641
Net long-lived assets | 10,217 |  |  |  | 10,509 |  |  |  | 10,217 | 10,509 |
United States |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenue |  |  |  |  |  |  |  |  | 65,942 | 72,753 | 60,952
Operating income (loss) |  |  |  |  |  |  |  |  | 726 | 2,755 | (51)
Net long-lived assets | 9,893 |  |  |  | 10,039 |  |  |  | 9,893 | 10,039 |
China |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenue |  |  |  |  |  |  |  |  | 9,500 | 17,634 | 12,673
Operating income (loss) |  |  |  |  |  |  |  |  | 3,686 | 5,445 | 3,647
Net long-lived assets | 236 |  |  |  | 293 |  |  |  | 236 | 293 |
France |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenue |  |  |  |  |  |  |  |  | 4,898 | 6,129 | 5,588
Operating income (loss) |  |  |  |  |  |  |  |  | (786) | (3,058) | (1,000)
Net long-lived assets | $ 88 |  |  |  | $ 177 |  |  |  | 88 | 177 |
Other |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenue |  |  |  |  |  |  |  |  | 4,695 | 3,537 | 3,860
Operating income (loss) |  |  |  |  |  |  |  |  | $ 1,290 | $ 930 | $ 1,045

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